<template>
  <div class="header">
    <!-- 折叠按钮 -->
    <div class="collapse-btn" @click="collapseChage">
        <i class="el-icon-menu"></i>
    </div>
    <div class="logo" @click="collapseChage">项目基础模板</div>
    <div class="header-right">
      <div class="header-user-con">
        <!-- 全屏显示 -->
        <div class="btn-fullscreen" @click="handleFullScreen">
            <el-tooltip effect="dark" :content="fullscreen?`取消全屏`:`全屏`" placement="bottom">
                <i class="el-icon-rank"></i>
            </el-tooltip>
        </div>
        <!-- 消息中心 -->
        <div class="btn-bell">
            <el-tooltip effect="dark" :content="message?`有${message}条未读消息`:`消息中心`" placement="bottom">
                <router-link to="/">
                    <i class="el-icon-bell"></i>
                </router-link>
            </el-tooltip>
            <span class="btn-bell-badge" v-if="message"></span>
        </div>
        <!-- 用户头像 -->
        <div class="user-avator"><img src="static/images/head_icon.jpg"></div>
        <!-- 用户名下拉菜单 -->
        <el-dropdown class="user-name" trigger="click" @command="handleCommand">
          <span class="el-dropdown-link">
              {{getUserName}} <i class="el-icon-caret-bottom"></i>
          </span>
          <el-dropdown-menu slot="dropdown">
            <a href="http://www.baidu.com" target="_blank">
              <el-dropdown-item>百度网页</el-dropdown-item>
            </a>
            <el-dropdown-item divided  command="loginout">退出登录</el-dropdown-item>
          </el-dropdown-menu>
        </el-dropdown>
      </div>
    </div>
  </div>
</template>
<script>
import { mapGetters } from "vuex";
export default {

  data() {
    return {
      collapse: false,
      fullscreen: false,
      name: 'admin',
      message: 2
    }
  },
  computed: {
    ...mapGetters('user', ['getUserName'])
  },
  methods: {
    // 用户名下拉菜单选择事件
    handleCommand(command) {
      if (command === 'loginout') {
        this.$router.push('/login')
      }
    },
    // 侧边栏折叠
    collapseChage() {
      this.collapse = !this.collapse
      this.$root.bus.$emit('collapse', this.collapse)
    },
    // 全屏事件
    handleFullScreen() {
      let element = document.documentElement
      if (this.fullscreen) {
        if (document.exitFullscreen) {
          document.exitFullscreen()
        } else if (document.webkitCancelFullScreen) {
          document.webkitCancelFullScreen()
        } else if (document.mozCancelFullScreen) {
          document.mozCancelFullScreen()
        } else if (document.msExitFullscreen) {
          document.msExitFullscreen()
        }
      } else {
        if (element.requestFullscreen) {
          element.requestFullscreen()
        } else if (element.webkitRequestFullScreen) {
          element.webkitRequestFullScreen()
        } else if (element.mozRequestFullScreen) {
          element.mozRequestFullScreen()
        } else if (element.msRequestFullscreen) {
          // IE11
          element.msRequestFullscreen()
        }
      }
      this.fullscreen = !this.fullscreen
    }
  }
}
</script>
<style scoped>
    .header {
        position: relative;
        box-sizing: border-box;
        width: 100%;
        height: 70px;
        font-size: 22px;
        color: #fff;
    }
    .collapse-btn{
        float: left;
        padding: 0 21px;
        cursor: pointer;
        line-height: 70px;
    }
    .header .logo{
        /* float: left; */
        /* width:250px; */
        display: inline-block;
        line-height: 70px;
        cursor: pointer;
    }
    .header-right{
        float: right;
        padding-right: 50px;
    }
    .header-user-con{
        display: flex;
        height: 70px;
        align-items: center;
    }
    .btn-fullscreen{
        transform: rotate(45deg);
        margin-right: 5px;
        font-size: 24px;
    }
    .btn-bell, .btn-fullscreen{
        position: relative;
        width: 30px;
        height: 30px;
        text-align: center;
        border-radius: 15px;
        cursor: pointer;
    }
    .btn-bell-badge{
        position: absolute;
        right: 0;
        top: -2px;
        width: 8px;
        height: 8px;
        border-radius: 4px;
        background: #f56c6c;
        color: #fff;
    }
    .btn-bell .el-icon-bell{
        color: #fff;
    }
    .user-name{
        margin-left: 10px;
    }
    .user-avator{
        margin-left: 20px;
    }
    .user-avator img{
        display: block;
        width:40px;
        height:40px;
        border-radius: 50%;
    }
    .el-dropdown-link{
        color: #fff;
        cursor: pointer;
    }
    .el-dropdown-menu__item{
        text-align: center;
    }
</style>
